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A 25.0 mL sample of a 0.1900 M solution of aqueous trimethylamine is titrated with a 0.2375 M solution of HCl. Calculate the pH of the solution after 30.0 mL of acid have been added; pKb of (CH3)3N = 4.19 at 25°C.
A voltaic cell is created with one half-cell consisting of a copper electrode immersed in 1.0 M CuSO4 solution and the other half cell consisting of a lead electrode immersed in a 1.0 M Pb(NO3)2 solution. Each half-cell is maintained at 25o C. Wha..
The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about 4.1 103 Calories. If an athlete expends 1975 kJ/h, how long does she have to play to work off 1.0 lb of body fat?
indicate how the partial pressure of hydrogen will change if the following stresses are applied to the equilibrium
A specific steroid has max = 291 nm and molar absorptivity = 11,500. What is the concentration of the compound in a solution whose absorbance at 291 nm is A = 0.050 with a sample pathlength of 1.00 cm
if you start with 5.5 grams of lithium chloride, how many grams of calcium chloride will be produced? mg+2naf=mgf2+2na
High purity silicon is obtained using a 3 step process. The first step involves heating solid silicon dioxide (SiO2) with solid Carbon to give solid and carbon monoxide gas. In the second step, solid silicon is converted into liquid silicon tetrachlo..
calculate the concentration of an NaOH solution if 25.0ml of the solution is needed to neutralize 17.5ml of a 0.419M HCL solution
A 4.50 g sample of NaOH at 25°C dissolves in 75.0 mL of water also at 25.0°C. The final equilibrium temperature of the mixture is 40.5°C. What is the enthalpy of solution, ?Hs, of NaOH expressed in kilojoules per mole
The Ksp of magnesium carbonate, MgCO3, is 6.82 × 10-6. Calculate the solubility of this compound in g/L.
How much Au is deposited if 10 Amp of current is passed for one hour in the reaction of Au3+ + 3e- ______Au
The stannous fluoride in a 10.000g sample of toothpaste was extracted and then percipitated with lanthanum nitrate solution. If the mass of the percipitate is 0.105g explain what is the percentage of stannous fluoride in the toothpaste sample
The half-life for the radioactive decay of [U]-238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the [U]-238 atoms in a sample of [U]-238 to decay?
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